Web winding machine with cut-off



Nov. 5, 1968 J. J. FARRELL 3,409,241

WEB WINDING MACHINE WITH CUT-OFF Filed March 29, 1967 5 Sheets-Sheet 1INVENTOR I W W L mm-wmk ATTORNE Y5.

Nov. 5, 1968 J. J. FARRELL WEB WINDING MACHINE WITH GUT-OFF Filed March29, 1967 5 Sheets-Sheet 2 INVENTOR BY M mm \r wk,

AT TORNEY$.

Nov. 5, 1968 J. J. FARRELL 3,409,241

WEB WINDING MACHINE WITH CUT-OFF Filed March 29, 1967 r 5 Sheets-Sheet 5w QM INVENTOR BY \M \NM mwaxsm ATTORNEYS.

NOV. 5, 1968 FARRELL 3,409,241

WEB WINDI NG MACHINE WITH CUT-OFF Filed March 29, 1967 5 Sheets-Sheet 492 FIG. 7.

236 INVENTOR mm r AT TORNE Y5 Nov. 5, 1968 J. J. FARRELL 3,409,241

WEB WINDING MACHINE WITH CUT-OFF Filed March 29, 1967 5 Sheets-Sheet 5y'aa! INVENTOR BY M .\M.

ATTORNEYS.

United States Patent 3 409,241 WEB WINDING MACHINE WITH. CUT-OFF John J.Farrell, 40 Abby Lane, Green Brook, NJ. 08812 i Filed Mar. 29, 1967,Sci. N0. 626,758

15 Claims. (Cl. 24256) ABSTRACT OF THE DISCLOSURE This disclosure is ofa winder having a turret with two or more cores on which a continuouslysupplied web is Wound and with provisions for cutting the web when thewinding on one core is complete and transferring the winding of'the webto an empty core without interrupting the web feed downstream from aknife or shear that makes the cut. The winder has a shear with which isassociated guiding means including a shroud for guiding the new end of acut web around the circumference ofan empty core, and the guiding meansis adjustable for cores of different diameter. Part of the cutting shearis moved out of the path along which a full core moves as the turretturns to shift the full core out of winding position and to bring anempty core into wind position.

7 Brief description of the invention This invention is an improvedflying transfer winder. One object of the invention is to incorporate ashear into the winder and obtain faster and uninterrupted changeoverfrom a fully wound core to a new and empty core.

The shear blade that is fixed during the shearing operation is carriedon an arm by which the blade is moved out of the way during transfer ofa full core away from winding positionand the substitution of an emptycore at the winding station.

The movable shear blade deflects the new end of the cut web toward abaffie that serves as guide means for starting the wrapping of the newend of the web on an emptycore. The guide means are constructed so thata cushion of air eliminates friction of the web on the baffle. There isa decreasing clearance between the baflle and the core as the baflieextends around the core in the direction in which the core turns towind, and this decreasing clearance guides the new end of the web intoits initial contact with the empty core and holds the web against thecore to start the wrapping on the empty core.

The guide means include also springs that hug the circumference of thecore around a part of the circumference and these springs are movableout of the way when using a small core that does not require the extralength of the bafiles that the springs supply.

Other objects, features and advantages of the invention will appear orbe pointed out as the description proceeds.

Brief description of the drawings In the drawings, forming a parthereof, in which like reference characters indicate corresponding partsin all the views;

in FIGURE 2;

FIGURE 4 is a greatly enlarged side elevation showing the shear assemblyof the flying transfer apparatus illustrated in FIGURE 1;

FIGURE 5 is a front view of the operating mechanism shown at the top ofFIGURE 4 for swinging the arm and 3,409,241 Patented Nov. 5, 1968 bladeof the shear out of the way full core from the winding position;

FIGURE 6 is a fragmentary, enlarged view showing the movable shear bladeillustrated in FIGURES l and 4 and the operating mechanism for the shearblade;

FIGURE '7 is a greatly enlarged view of the shear and the web guidemeans as shown in FIGURES 1 and 4, and illustrating the operation of theinvention with cores of different diameter; and

FIGURE 8 is a fragmentary, detailed sectional view on the line 8-8 ofFIGURE 7 and illustrating the means for adjusting the fixed blade of theshear.

FIGURE 9 is a rear view part of the apparatus shown in FIGURE 7 forlatching the arm that carries one of the shear blades.

FIGURES 10 and 11 are sectional views on the lines 1010 and 1111 ofFIGURES 1 and 10, respectively.

prior to transfer of a Detailed description 0/ the invention Theapparatus shown in FIGURE 1 includes a winder 20 having a frame 22 whichrests on a floor 24 or other underlying support. The opposite sides ofthe frame 22 are connected together by transversely extending connec-IOIS 26.

A portion of the frame 22. the left hand portion in FIGURE 1, has atrack 30 of inverted V cross-section; and there is a carriage 32 whichslides along the track 30. The carriage 32 has an inverted V groove 36(FIG- URE 3) which fits the track 30 to prevent transverse movement ofthe carriage 32 on the track.

A cylinder and piston motor 40 is connected with a lug 42 extendinginward from the frame 22. The motor 40 has a piston rod 44 connected bya pivot connection 46 to a lug 48 extending downward from the lower partof the carriage 32 between the rails 30. Thus the operation of the motor40 moves the carriage 32 back and forth along the rails 30. In FIGURE 1,the carriage 32 is shown at the right hand limit of its movement, thepiston rod 44 being fully extended.

' On the carriage 32 there are rolls 51, 52 and 53. These rolls form aloop accumulator, The rolls 51 and 52 have axles 54 which are at fixedpositions on the carriage, and the roll 52 has an axle 56 carried in abearing of a movable block 5 which is urged upwardly by a spring 60.

A web 62 of material to be wound passes under the rolls 51 and 53 andover the roll 52. As tension on the web 62 increases, the spring 60yields to permit the roll 51 to move downward and to reduce the lengthof the loop; and as tension on the web 62 slaekens, the spring 60 pushesthe roll 51 upward to maintain the tension of the web 62.

On the carriage 32 there are feed rolls 66 and 67. The roll 67 is belowthe web 62 and is driven by a pulley 69 through a belt 70 which isoperated by a motor 72.

The upper roll 66 is carried by an arm 74 which swings about an axle 76.The arm 74 is moved angularly about the axle 76 to shift the roller 66into and out of contact with the web 62 which passes between the rolls66 and 67.

There is a motor 78 for moving the arm 74. When the motor 78 isenergized, it moves the roll 66 downward so that the roll 66 presses theweb 62 against the roll 67 and produces friction for feeding the web 62.When the motor 78 is not energized, the web 66 passes across the roll 67with little or no friction and the rolls 66 and 67 do not feed the web.

The carriage 32 also supports a shear assembly including a movable blade82 and a backing blade 84. This backing blade is the fixed blade of theshear assembly when shearing, but the backing blade is carried on an arm86 which swings about a pivot 88 in response to operation of a motor 90which is connected with the arm 86 by a bell crank 92.

The purpose of the arm 86 is to swing the backing blade 84 out of theway, for purposes which will be explained later, at certain times duringthe operation of the apparatus. The pivot 88 is supported by a crossbeam 96 which extends between opposite sides of the frame ofthe carriage32.

The construction of the Winder 20 is merely shown diagrammatically sincethe details of the construction form no part of the present invention.It is sutficient to understand that the winder has a circular turret arm98 at each side of the winder. The circular turret arm 98 has gear teetharound its circumference which mesh with gearing 100 driven by a motor.This comprises the drive for the turret arms 98, the arms on both sidesof the winder being driven in synchronism.

Each of the turret arms 98 rotates about an axle 102; and each of theturret arms support drive spindles 104 which have chucks for holding theopposite ends of cores 106 on which the web is wound. The spindles 104are power driven but for purposes of clearer illustration this guide isshown diagrammatically as a motor 108 connected with each of thespindles 104.

The right hand core 106 in FIGURE 1 is shown fully wound with a spiralof the web 62 and the apparatus is shown in position ready to cut theweb adjacent to the empty core 106 at the left hand side of the turretarm 98 preparatory to starting a wrap of web on the empty spindle 104 ina manner which will be described in connection with the other views. Thefull core 106 is removed from the spindles 104 and replaced with anempty core while the web is winding on the other core.

FIGURE 2 is a top plan view of the loop accumulator shown in FIGURE 1,but without the web 62. There is a transverse column 112 below the roll52 which constitutes part of the structure of the frame of the carriage32.

FIGURE 3 shows two of the rolls 52 and 53 and shows the motor 72. Theprincipal purpose of this view, however, is to show the tracks 30 alongwhich the carriage 32 slides to .move it toward and from the winder.

FIGURE 4 shows the shear assembly. This view also shows the end of thecarriage 32 and shows a cut-out 116 which extends back behind the core106 so as to provide clearance for the core. The pivot connection 88 isconnected with the beam 96 by a bracket 118 fastened to the beam 96 byscrews 120. The crank arm 92 is rigidly connected with the arm 86,either by being of one piece construction with it or by being keyed tothe same pivot connection 88 as the arm 86. 9

Motor 90 has a piston rod 124 and a pivot connection 126 to the crankarm 92. The motor 90 is pivotally supported on a pivot connection 130carried by a bracket 132 which is preferably welded to the cross beam96. When the motor 90 is at one end of its stroke, the arm 86 occupiesthe full line position shown in FIGURE 4 and opposite ends of the arm 86bottom against edges 130 of the frame 32. This puts the knife blade 84in position for cooperation with the movable blade 82 to sever the web62.

When the motor 90 operates to move the bell crank 92 counterclockwise,the pivot connection 126 moves downward into the dotted line positionshown in FIG URE 4 andthe arm 86 moves up into the dotted line positionto lift the knife 84 high enough to clear the core 106 when the carriage32 moves away from the winder; that is, towards the left in FIGURE 4. A

The movable knife blade 82 is carried by brackets 132 which areconnected with eccentric straps 134 surrounding eccentrics 136 on adrive shaft 140. The spacing of the eccentrics and-eccentric strapsalong the drive shaft 140 is shown in FIGURE 6. While only two eccentricstraps are shown, it will be understood that there are a plurality ofsuch straps at spaced points across the width of the knife 82 and thewidth of the knife depends upon the size of the machine and the maximumwidth of Web on which the machine is intended to be used.

The shaft has a pulley 142 secured to it and power is supplied to thepulley 142 from a motor 144 (FIGURE 4) carried by a plate 146 whichhangs from a shaft 148 extending across a part of the carriage 32. Theplate 148 is urged to swing clockwise by a spring 150 on a bolt 152attached to a part of the carriage frame. The compression of this spring150 maintains a tension in a belt 154 which connects a pulley 156 of themotor with the pulley 142 on the shaft 140 which drives the eccentrics136.

In the preferred construction, the pulley 142 is connected with theshaft 140 through a single revolution clutch 160 (FIGURE 6). Suchclutches are well known in the art and no description of theconstruction of the clutch is necessary for a complete understanding ofthis invention. Each time that the clutch 160 is engaged, preferably bytimed operations of an air cylinder, the pulley 142 rotates the shaft140 through one-half revolution and then the clutch disengagesautomatically. Thus the knife blade 82 moves upward to sever the web andremains there until the transfer cycle has been completed. The clutch isagain engaged to return the blade to its original position, where itagain stops.

In FIGURES 4 and 6 the knife blade 82 is shown in its uppermost positionto illustrate the manner in which it cooperates with the other knifeblade 84. It will be understood that in FIGURE 4 the web 62 has justbeen severed by upward movement of the blade 82.

At the forward end of the carriage 32 there is another roll 164 which issupported from the carriage by an axl 166 carried by brackets 168 on thefront of the carriage 32. This roll 140 moves into contact with the web62 and lifts the web as the carriage 32 advances toward the right inFIGURE 4 so that the web will extend across the top of the knife blade82 when the knife blade is in retracted position preparatory to making acut.

FIGURE 7 shOWs the arm 86 in more detail. In FIG- URE 4 the purpose ofthe illustration was to show the knife and the manner in which the arm86 could swing counterclockwise to clear the core 106 so that thecarriage could be withdrawn after a new end of a web had begun to windon a new core. FIGURE 7 shows the baffles which are connected with thearm 86 for the purpose of guiding the new end of a severed web and forstarting the wrapping of the web on an empty core.

A bafile 172 is connected with the arm 86 by a bracket 174 and pivotconnection 175. An arm 178 is secured to the outside of the baffle 172and this arm 178 has a pivot connection 180 with a piston rod 182 of acylinder and piston motor 184.

The motor 184 is connected with the arm 86 by a swivel 186 and when themotor is operated to move the arm 178 between the full line and dottedline positions shown in FIGURE 7, the bafile 172 swings on its pivotconnection 175 between the solid and dotted line positions shown. Thuswhen the baffle 172 is in the solid line position it is operative withthe core 106 and when it is swung into the dotted line position it is inposition for cooperation with a core 106 of smaller diameter.

The bafiie 172 is located so that it has a substantial clearance fromthe core 106 in the region of the pivot connection 175; but thisclearance decreases progressively in the direction in which the core 106turns when winding a web. When the clearance between the bafilc 172 andthe core 106 has decreased to a desired minimum, the further length ofthe bafiie 172 is concentric with the circumference of the core 106, butit preferably does not touch the core or a web which is winding on thecore. In order to prevent the baffle 172 from touching the core or web,and thus producing friction and possibly scratching the web, the battle172, along the portion which is concentric with the core 106, has an airoutlet 190 through which air under some compression is discharged towardthe core to produce an air cushion between the bafiie 172 and the core106 across the entire width of the battle 172 and around that portion ofthe circumference of the baffle 172 which would otherwise touch the core106.

Beyond the endfof the portion of the baffle 172 which is concentricwiththe core 106, there is a spring extension 192' which is curved tohug the circumference of the core 106 or the outside of a web which iswinding on the core.v This spring 192 is flexible and has a low springrate'so thatwhen the baffle 172 is used with the smaller diameter core106, the spring 192 will still hug the core 106, or the web, for atleast a portion of the circumference' of the core 106. The air dischargeoutlet 190 also moves into position to maintain a blanket of air betweenthe baffie172 and the smaller arc of the baifle which would otherwisecontact with the small diameter core 106". o

'There is another bafile 196 attached to the arm 86 by a bracket'198 and'a pivo t connection 199. An extensiohflbracket 200 attached to the arm86 projects to the left from the bracket 198 and supports a cylinder andpiston motor 202 on a swivel 204 attached to the extension bracket 200.The motor 202 has a piston rod 208 connected with a lug 210 on thebaffle 196. Operation of the'motor202 swings the bafile 198 about itspivot connection 199 to move the baffle 196 into different positions forthe large core 106 or the small core 106'.

' The baffle 196, like the baffle 172, has an air discharge outlet 216inposition to maintain an air blanket between the bafile 196 and the core106 or 106'. In the case of both of the baffles 172 and 196, the airsupply passage for the'air outlets 216 and 190 pass along the length ofthe baffles 196 and 172 and connects with a source of compressed airthrough a swivel joint at the pivot connections 199 and 175. Suchconnections for supplying a' fluidfrom' a fixed location to a movableelement are well understood in theart and no description of them isnecessary for a complete understanding of this invention. The battle 196has aflexible leaf spring 220 extending from its free end and thisspring 220 is shaped to hug the core 106 but is not required when usingthe small core 106 because a Web, indicated by the reference character62, when winding on the small core 106' is in position.to' overlap theend of the web which comes beyond the bafl le 196 as will be apparentfrom the geometry of FIGURE 7. Thus the spring 220 is turned back intoan inoperative position when using the apparatus with the small core106'. However, when the apparatus is being used to wrap a new endportion of a web, indicated by thereference character 62a on a largecore such as the core 106, the spring220 is placed in the full lineposition for guiding 'the free end of the web until it is ready to beoverlapped by the winding web 62a forming a second layer of wrap.

FIGURE 7 also shows the way in which the movable sheariblade 82 liftsthe web 62 when it cuts it. As the new end of the web continues toadvance, as the result of 'the feeding by the feed rolls 66 and 67(FIGURE 4), the web passes across the sloping top face of the blade ,84and along a similar sloping surface 226 which leads the ,new endof theweb to the guiding surface provided by the baffle 72. FIGURE 8 shows theknife or shear blade 84 and the manner in which it can be adjusted tokeep the entire edge in exactly the same position for cooperation withthe movable blade 82. The blade 84 is connected with o the arm 86 bybolts 230 which extend through slots 232 in the blade 84.. When thesebolts or screws 230 are loosened, the blade 86, or a portion of it canbe thrust in one direction by screws 234 threaded through the downwardlyextending portion of the arm 86. These screws 234 thread through part ofthe arm 36 and have their heads in counterbores 236 of the threadedholes into which the screws fit. There are other screws 238 which extendinto the blade 84 and which are held against axial movements in theblade by snap rings 240. These screws 238 thread through nuts 242 at theback of the lower 6 part of the arm 86 and can be used for pulling aportion of the blade 84 back toward the base of the arm 86 whichconfronts the back of the blade 84. Thus by means of these differentscrews 234 and 238, the 'blade 84 can be aligned with the movable bladeto always ob-, tain a clean cut across the full width of the web.

FIGURE 9 is a view looking at the opposite side of the apparatus fromFIGURE 7 and showing latching mechanism that is similar at both sides ofthe apparatus but which is broken away in FIGURES 4 and 7 in order toshow other structures.

The movable blade 82 moves up and down through a guide 248 at the top ofcross beams 250 that are part of the frame of the carriage 32. Thisguide is preferably adjustable by screws 253 in addition to theadjustment of the backing blade 84 already described.

During a shearing operation there are forcestrying to push the blade 84away from the blade 82; and in order to hold the blades in workingrelation to one another there is a latch 254 at each side of the arm 86.These latches 254 engage behind stops 256 adjustably connected withopposite ends of one of the beams 250 by bolts 258.

Each latch 254 is located in a slot 259 in the lower part of the arm 86which carries the knife blade 84; and the latch 254 is connected, to thearm 86 by a pivot connection 260. The latch is moved angularly about thepivot connection 260 by a toggle link 262. One end of the toggle link262 is connected to the latch 254 by a pivot 264; and the other end ofthe toggle link is connected to the arm 86 by a pivot 266. Acylinder-andpiston motor 268, preferably an air cylinder, has its pistonrod 290 connected to a center pivot 272 of the toggle link 262. When thepiston rod 270 moves upward in FIGURE 9, the toggle link 262 moves thlatch 254 from the solid line position to the dotted line position, andreleases the latch 254 from the stop 256.

The stops 256 at opposite sides of the apparatus are adjusted to set theclearance between the blades 82 and 84 after the initial setting ofparallelism of blade 84 in relationship to blade 82 by the constructionpreviously described in connection with FIGURE 8.

When the apparatus is operated, the arm 86 is lowered into transferposition and it overtravels the working position of the blade 84. Thiscarries each latch 254 beyond its stop 256, to the right in FIGURE 9.The motor 268 is then operated to lower the latch 254. The motors 90(FIG. 4) that lower the arm 86 are then reversed; and this pulls thelatches at both sides of the frame 32 up against the stops 256 and holdsthem there during the cutting or shearing of the web.

FIGURES l0 and 11 show rollers 278 carried by axles 280 disposed atangularly spaced locations around the. frame 22 for taking axial thrustof the circular turret arm 98. There are other rollers 284 on axles 286attached to the turret arm 98 and serving as roller bearings betweenconfronting cylindrical faces 290 and 292 of the frame 22 and turret arm98, respectively. The construction is the same at both sides of theapparatus.

The preferred embodiment of the invention has been illustrated anddescribed, but changes and modifications can be made and some featurescan be used in different combinations without departing .from theinvention as defined in the claims.

What is claimed is:

'1. The combination with a turret web winder that has holders for twocores on a turret which can be rotated to move a full core around to arearward position while bringing an empty core to a forward position,the combination with said winder of a shear assembly having upper andlower parts between the opposite sides of the turret and over and underthe empty core, an arm carried by the upper part of the assembly andmovable with respect to the assembly downward behind the core andpartway under the core from behind said core, a first shear blade, meansfor holding the first shear blade in a fixed position, a second andmovable shear blade carried by the lower part of the shear assembly in aposition beneath the core and adjacent to the fixed blade, means guidinga web across the top of the movable shear blade and under the fixedblade as the web travels to and winds upon the core at the rearwardposition in the turret, means for moving the movable shear blade withrespect to the fixed blade to cut the web, and guide means that deflectthe new end of the web around the empty core to start the web Wrappingon the empty core.

2. The combination described in claim 1 characterized by the movableshear blade moving on its cutting stroke in a direction to deflect theweb toward the empty core, the guide means including a shroud extendingaround the empty core in spaced relation thereto, and means for rotatingthe empty core to wind the web thereon as the new end of the web isdeflected around the emptycore by said shroud.

3. The combination described in claim 2 characterized by means forlocking the fixed shear blade in position under the empty core, and amotor for operating the looking means.

4. The combination described in claim 3 characterized by an adjustableconnection between the fixed shear blade and its support at a locationbetween the locking means and the fixed shear blade for aligning thefixed shear blade with the movable shear blade, and an adjustable stopfor determining the position at which the fixed shear blade stops withrespect to the movable shear blade.

5. The combination described in claim 2, characterized by the shroudextending from close to the shear to a location around a substantialpart of the circumference of the empty core, and a second shroudextending for substantially the remainder of the distance around theempty core to guide the new end of the web until it passes under anoverlapping portion of the web as it wraps on the empty core.

6. The combination described in claim 1 characterized by the guide meansthat deflect the web around the empty core having surfaces that hold theweb in contact with the core around at least a substantial portion ofthe circumference of the core, the guide means having baffle surfaceswith air between the web and baffle surface for urging the web againstthe core without substantial friction of the web on the baffle surfaces.

7. The combination described in claim 1 characterized by the guide meansbeing movable into different positions for use with cores of differentdiameters, means for moving the guide means between said differentpositions, the guide means being of composite construction and havingportions that move relative to one another to shorten the guide meanswhen moved into position for use on a core of smaller diameter.

8. The combination described in claim 7 characterized by the guide meanshaving progressively less clearance from the core in the direction ofrotation of the core, and the portions closest to the core being aspring that hugs the core.

9. The combination described in claim 8 characterized by a hingeconnecting the spring to the rest of the guide, the spring being movableangularly about the hinge to shift the spring into an inoperativeposition when using the guide with a small diameter core.

10. The combination described in claim 1 characterized by the shearassembly including a carriage movable toward and from the turret, rearportions of the assembly that move into and out of position betweenopposite sides of the carriage, the arm that is carried by the upperpart of the shear assembly being pivotally connected thereto and movabledownward behind the core and partway under the core when the carriage isin position to locate the rear portions of said assembly betweenopposite sides of the turret, and power-operated latch means for boldingthe arm and said second shear blade in operative position with respectto the first shear blade during a shearing operation, v V v 11. Thecombination described in claim 10,character ized by a roller carried bythe carriage and extending across the lower side of the web when the webis winding on a rearward core of the turret, said roller being in adefinite position with respect to the shearblades for lifting the webinto a shearing position as the carriage moves toward the turret. v I

12. Guide means for deflecting theendportion of .a web around a core atthe start of a winding operation including a frame withportionsr'located on different sides of the core, a first baffie havinga-curved guide surface extending partway around the circumference ofthe, core, said surface being progressively closer to the core as itextends in the direction in which the core turns to Wrap a web thereon,a pivot connection at the end of the battle that is furthest from thecore surface, a spring at the other end of the baffle curved to hug acore of a given diameter, a second baffle having a curved guide surfaceextending around at least a part of the remainder of the circumferenceof the core, a pivot connection by which the second baffle is connectedwith the frame, and means for swinging both of the baffles on theirpivot connections to move their ends that are remote from the vpivotsinward for use with cores of smaller diameter.

13. The combination described in claim 12 characterized by the springportion of the first baffle extending into contact with the guidesurface of the second bafile, and the pivot connection of the firstbafi'le being correlated with the location of the guide surface of thesecond bafiie to cause the spring of the first bafile to moveprogressively further along the second baffie in acircumferentialdirection away from the first bafile and radially inwa-rd as the bafilesare adjusted for cores of smaller diameter.

14. The combination described in claim 12 characterized by the secondbaffle having its guide surface progressively closer to the core in adirection away from the pivot connection of the second bafile with theframe, and the spring length on the first bafile being correlated withthe second 'bafile so that the spring'isbent to progressively smallerradii of circumference and held in substantial contact with thecircumference of cores of smaller diameter when the bafiles are movedabout their pivot connections to adjust them for cores of smallerdiameter.

15. The combination described in claim 13 characterized by an arcuatespring on the' end of the second bafile remote from the pivot connectionand extending the guiding surface of the second baffle around most ofthe remaining circumference of the core not covered by the first baffie,a hinge connecting the spring on the second baffle to the other part ofthe second baffie and about which the spring of the second bafile swingsaway from the core and out of guiding position when the bafiles areadjusted for "a core of smaller diameter and a circumference thatdoesnot require the extended length of the second baffle provided by itsspring.

References Cited 'UNITED STATES CPATENTS LEONARD D. CHRISTIAN, PrimaryExaminer.

